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　　American defense officials have insisted that a raid by US and Kurdish forces on a prison runby Islamic State militants in Northern Iraq is not a change of tactics. About 70 hostages werefreed. From Washington, here's Gary O'Donoghue. The press secretary Peter Cook saidinformation had suggested that the prisoners were facing imminent mass execution withinhours. American helicopters transported troops to the town of Hawijah, 40 miles southwest ofKirkuk. Officials here say a number of IS militants were killed in the raid and five captured, alongwith what they described as important intelligence about the militant group. It's the firstAmerican combat casualty in the fight against Islamic State. Nevertheless, the head of CentralCommand said the operation had been highly successful.

　　Vladimir Putin has defended Russia's military intervention in Syria saying it could help createconditions for a political solution to the civil war. Bridget Kendall watched him speak in Sochi.President Putin's comments were woven through with mixed messages and contradictions. Onthe one hand, he accused the US and its allies of playing a double game in Syria attackingsome terrorist groups while siding with others for their own ends. He said the West's attemptto divide terrorist groups into moderate and non-moderate was mistaken. On the other hand,he also seemed to concede that Russia would need to bring the US led-coalition and Syria'smoderate opposition forces on board for any political settlement to work. He said he stillhoped the US would agree to work with Russia and he even asked president Assad, who was inMoscow this week, if he could work with moderate opposition forces on the ground. Mr. Putinwas clear he was ruling out partition for Syria.

　　The front-runner for the Democratic presidential nomination Hillary Clinton has accused herRepublican rivals of exploiting the death of American diplomats in Libya in 2012 for political gain.She was testifying before a congressional committee investigating the attack on the USdiplomatic compound in Benghazi. Barbara Plett Usher is at Capitol Hill. The hearing had beenwidely anticipated as a showdown between Hillary Clinton and her Republican critics. Theyquestioned how engaged she had been on the deteriorating situation in Libya before theBenghazi attacks. And they returned to the issue of why the state department had failed torespond to requests for increasing security by the ambassador Chris Stevens. Once againMrs. Clinton said that security personnel normally doubted with such requests that neverreached her desk, but she had amost emotional moment over accusations that shedeliberately ignored the demands. The exchanges didn't appear to review significantly newinformation although perhaps new details.

　　Swedish police are investigating whether a masked man who killed a teacher and a pupil at aschool near Gothenburg was motivated by extreme right wing views.The attacker criticallyinjured another teacher and a child before he was shot dead. This is the world news from theBBC.

　　An American nurse is suing the governor of New Jersey for being put into quarantine after shereturned from West Africa where she had been treating Ebola patients. Kaci Hickox alleges thatGovernor Chris Christie abused her civil liberties by imposing a mandatory quarantine on herin October last year without a valid reason.

　　Hundreds of indigenous people from around the world have taken part in a traditional firelighting ceremony in Brazil on the eve of the first World Indigenous Games in the city ofPalmas. Nicholas Rocha has the details. The athletes will be competing in traditional sports likefootball and athletics, but also indigenous games like archeries, spear-throwing, canoeing andrace through forests. As well as peoples from all the Americas,there are delegations fromAustralia, Russia, the Philippines, Ethiopia and New Zealand. But the cost of staging the gameshas drawn some protestors. They say the money would have been better spent on improvingthe life of Brazil's indigenous people.

　　Researchers have found that male howler monkeys with the most powerful voices also have thesmallest testicles, but still manage to attract the most females.The scientist concluded thathaving a deeper call is more important than mere sperm production when it comes to winning amate. Here is our science reporter Victoria Gill. Across ten species of howler monkey, all themales try to impress females and intimidate rivals with a raucous vocal display. But asterrifying as that sounds, this research shows there is a reproductive cost to a booming voice.To study the animals' roars, the team measured the volume of a howler bone in their throatswhich act like a resonator, the larger that bone,the deeper that voice. Comparing anatomy crossthe species, the researchers noticed that monkeys with the deepest voices also have thesmallest reproductive organs. That report from Victoria Gill ends the BBC news.